Jupiter and Javelin alloy radiators

[Keith Clements]

Have you ever had cooling problems on a Jowett? An aly rad certainly helps- giving 30% or more heat transfer, plus it is considerably lighter- putting less load on your engine. There is even an argument that says there is less corrosion with no copper in the cooling system.

Some of you may have been following Scott's post on the subject. Whilst at the NEC for the Classic car show I met with Alastair Bailey of Coolex heat transfer who came to the Jowett stand and gave a tentative quote on manufacture of alloy radiators. We have now sorted out various issues of design, options, transport insurance, customs duties, etc to offer them for worldwide delivery.

The radiators will be close to original except for a modern pressure cap fitting and improved fin design for much better cooling. They will have the extended curved header tank, two inlet, two outlet and heater pipe fittings and a male temperature sensor fitting. They are offered in the UK at £450 +VAT.

Shipping abroad would cost £90 but no VAT and, since the Free On Board cost (£540) will be less than AUS$1000 or US$800, there may be no duties to pay. You should confirm about the level of insurance required with Coolex on order and on the duty payable with your customs.

You can have them painted with black etch primer for £25 extra cost or have them without the fan guard for £30 less. Please confirm the options when you order from Coolex. Please email Alastair Bailey of Coolex, alastair@coolexperts.co.uk but please copy me so I know what is happening. We already have some orders, so more the merrier. It is Christmas!

Should you require an alloy Javelin radiator then please contact me and we will go through a similar process with regards to oil cooler brackets etc. These are likely to be around the £200 mark as an 'off the shelf' rather than custom core can be used.

[Keith Clements]

The two original rads I have do not have a stepped core and those being manufactured will be straight. Some discussion ensued on if the overhanging header tank was necessary or if weight and manufacturing cost could be saved. We have chosen the overhanging. There was also discussion on heightening and deepening the core. We have chosen original dimensions. I have asked Coolex about corrosion as I did notice such on my Subaru after 10 years of salted roads. But the aly Jup rad is seldom exposed to such salt.
The answer is to wash all salt off immediately or have the etch primer coating. The later will reduce thermal efficiency slightly.

I have put this on JT so that all can share the discussion.

[Keith Clements]

I will be sending a Jav and Jup sample to Coolex shortly. Please make sure that you contact Alastair at Coolex and place your order and please copy me in. He will quote you for any options you desire such as black paint, lack of shroud and insurance. See other emails or posts for options or contact me.

Please get your orders into Alastair this week. info@coolexperts.co.uk

Note the cost of sending the sample will be shared by all and be in addition to that charged by Coolex. This charge will payable to me (PayPal or similar).


Something that came up in discussion was the advisability of having a ground strap on the rad to prevent electrolytic action. I have asked Coolex if a spade terminal be welded on as an option. I suggested it is placed a couple of inches up on the left (nearside) panel facing forwards which is close to where the starter is grounded